inky-lovelace/inky-lovelace.py

# inky-lovelace.py: Fetch a lovelace dashboard and display it on an inky-frame.
# Copyright (C) 2023 Paco Hope <github@filter.paco.to>
#
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
# 
# See LICENSE.md for details.

"""
Copy a PNG into the root of the pico from a known URL

Display it.

Sleep
"""

from picographics import PicoGraphics, DISPLAY_INKY_FRAME as DISPLAY    # 5.7"
from urllib import urequest
from machine import Pin, SPI
from network_manager import NetworkManager
import time
import ntptime
import inky_frame
import pngdec
import gc
import sdcard
import os
import CONFIG
import inky_frame
import uasyncio
global graphics

def display_image(j):
    # Open the PNG file
    j.open_file(CONFIG.FILENAME)
    graphics.set_pen(0)
    graphics.set_font('sans')

    # Decode the PNG
    try:
        j.decode()
    except Exception as e:
        # if that fails, try to recover enough to show
        # an error. This seems to fail sometimes and I
        # don't know why.
        del j
        gc.collect()
        graphics.text( e, 10, 200, scale=1 )

    # write the date/time at the top
    tz_seconds = (CONFIG.TZ_OFFSET * 3600)
    year, month, day, hour, minute, second, dow, _ = time.gmtime(time.time() + tz_seconds)
    # display.text(text, x, y, wordwrap, scale, angle, spacing)
    graphics.text(f"{hour:02}:{minute:02} {year}-{month}-{day}", 230, 10, scale=0.5)
    gc.collect()

def show_error(text,y):
    WIDTH  = 600
    HEIGHT = 0 + 20 * y

    graphics.set_pen(4)
    graphics.rectangle(0, HEIGHT, WIDTH, 35)
    graphics.set_pen(1)
    graphics.text(text, 5, 16 + HEIGHT, 400, 2)
    gc.collect()

def fetch():
    """ Fetch the image, store it onboard.
        Returns False at first error.
        Returns True only if everything succeeds.
    """

    inky_frame.button_b.led_on()
    network_manager = NetworkManager(CONFIG.COUNTRY, status_handler=status_handler, client_timeout=60)
    try:
        uasyncio.get_event_loop().run_until_complete(network_manager.client(CONFIG.SSID, CONFIG.PSK))
    except RuntimeError:
        pass
    except Exception as e:
        print("join network failed")
        print(e)
        inky_frame.button_b.led_off()
        return False
    inky_frame.button_b.led_off()

    tz_seconds = (CONFIG.TZ_OFFSET * 3600)
    year, month, day, hour, minute, second, dow, _ = time.gmtime(time.time() + tz_seconds)
    print(f"{hour:02}:{minute:02} {year}-{month}-{day}")

    count = 0
    if year < 2023:
        # blink d when we are setting the time
        inky_frame.button_d.led_on()
        ntptime.host = '0.us.pool.ntp.org'
        while count < 5:
          try:
            inky_frame.set_time() # set time from network
          except OSError as e:
            print( "x", end="" )
            count += 1
        inky_frame.button_d.led_off()

    if count >= 5:
        # turn on E to indicate error. gets turned off later.
        inky_frame.button_e.led_on()

    year, month, day, hour, minute, second, dow, _ = time.gmtime(time.time() + tz_seconds)

    # don't bother updating before 06:00 or after 23:00
    if hour < 5 or hour > 22:
        print(f"hour {hour:02}, no need to fetch")
        return False
    del year, month, day, hour, minute, second, tz_seconds, count
    print( "fetching " + CONFIG.IMG_URL )
    inky_frame.button_c.led_on()

    try:
        # Grab the image
        socket = urequest.urlopen(CONFIG.IMG_URL)
        gc.collect()
    except OSError as e:
        print("Unable open URL. OSErr: ")
        print(e)
    except Exception as e:
        print("other exception")
        print(e)
        return False
    os.remove(CONFIG.FILENAME)
    inky_frame.button_c.led_off()
    inky_frame.button_d.led_on()
    try:
        data = bytearray(1024)
        with open(CONFIG.FILENAME, "wb+") as f:
            while True:
                if socket.readinto(data) == 0:
                    break
                else:
                    print(".", end="" )
                f.write(data)
        socket.close()
        del data
    except Exception as e:
        print("Unable to write file")
        print(e)
        return False
    del socket
    inky_frame.button_d.led_off()
    gc.collect()
    return True

def status_handler(mode, status, ip):
    print(mode, status, ip)

def mount_sd():
    # set up the SD card
    try:
        sd_spi = SPI(0, sck=Pin(18, Pin.OUT), mosi=Pin(19, Pin.OUT), miso=Pin(16, Pin.OUT))
        sd = sdcard.SDCard(sd_spi, Pin(22))
        os.mount(sd, "/sd")
    except Exception as e:
        print("mounting SD card")
        print(e)
    
    files = os.listdir("/sd")
    if len(files) == 0:
        show_error("SD didn't mount?", 5)
    del files

while True:
    graphics = None
    gc.collect()
    inky_frame.led_busy.off()
    inky_frame.button_a.led_off()
    inky_frame.button_b.led_off()
    inky_frame.button_c.led_off()
    inky_frame.button_d.led_off()
    inky_frame.button_e.led_off()
    inky_frame.led_busy.on()

    inky_frame.button_a.led_on()
    mount_sd()
    gc.collect()
    inky_frame.button_a.led_off()
    if fetch():
        gc.collect()
        inky_frame.button_e.led_on()

        # set up the display
        graphics = PicoGraphics(DISPLAY)

        # Create a new PNG decoder for our PicoGraphics
        j = pngdec.PNG(graphics)

        display_image(j)
        # Display the result
        graphics.update()

    inky_frame.button_e.led_off()
    inky_frame.led_busy.off()
    # Go to sleep if on battery power
    inky_frame.button_a.led_off()
    inky_frame.button_b.led_off()
    inky_frame.button_c.led_off()
    inky_frame.button_d.led_off()
    inky_frame.button_e.led_off()
    inky_frame.sleep_for(CONFIG.UPDATE_INTERVAL)